2. Du Fu's poems are good at describing the historical reality at that time and reflecting the current situation of the Tang Dynasty from prosperity to decline, so they are called "the history of poetry". From the Anshi Rebellion to entering Shu, Du Fu experienced great turmoil and wrote a lot of realistic works.
3. Du Shishan observes the reality of life and society rationally and carefully, and understands the sufferings and joys of the people from his own life experience. He has a strong political consciousness and inherits and develops the realistic spirit of The Book of Songs, folk songs of Han Yuefu and Jian 'an literature.
4. Du Fu created a large number of seven-character metrical poems, which were extensive in content, skillful in techniques, focused on the antithesis of metrical patterns, rigorous in metrical patterns and refined in language. He is a model of all previous dynasties, and his achievements have made the creation of seven-character poems mature. He also wrote new Yuefu poems, describing the sufferings of society and people's livelihood.